. You need to specify an IP segment. You can define a local LAN (local area network) or other network segments that are allowed to access (scan).

2. If the scanned destination host establishes a security platform, such as a firewall or other software with firewall function, your scanned datagram will be blocked out of the port, so the form of presentation is that no surviving host can be found.

3. Please pay attention to the form and other detection options that you fill in during scanning. The first step is PING, so generally other detection items can be queried.

4. Because maybe your computer is in the Internet cafe.

Or the principle of broadband network you use is internal LAN.

That's why this is happening.

5. When setting the scanning range, there are one of the following.

[] unconditional scan

Hook scanning